Magnetism 2

<?xml version="1.0" encoding="UTF-8"?>  <XholonWorkbook> <Notes><![CDATA[ Khan Academy ------------ Title: Magnetism 2 Description: Magnetic fields and their effects on moving electrical charges Url: http://www.khanacademy.org/video/magnetism-2 InternalName: magnetism-2 YoutubeId: NnlAI4ZiUrQ Keywords: physics, magnetic, field, cross, product My Notes -------- Magnetic fields visualization field lines bar magnet with N pole and S pole convention is to draw lines from the N pole to the S pole imagine a hypothetical monopole trying to escape from N to get to S another way to think about it 2:30 a compass pointer would be tangent to the field lines N pole of compass pointer points to S pole of magnet magnitude of a magnetic field at any point defined in terms of the effect it has on a moving charge a magnetic field is an electromagnetic field moving at a high/relativistic speed example B (B⃗) is a vector that's a magntic field the force (F) on a moving charge (proton, electron, etc.) = the magnitude of charge * (the velocity of the charge CROSS the magnetic field) F = Q · (v × B) where F, v and B are vectors( F⃗ v⃗ B⃗ ) and Q is a scalar the cross product is concerned with vectors that are perpendicular to each other if v is exactly perpendicular to B, then F has a value if they are parallel, then there is no impact F is perpendicular to both v and B magnitude of the force F |F⃗| = Q * |v⃗| * |B⃗| * sin θ where θ is the angle between v and B units of the magnetic field B sin θ has no units F is Newtons (N) Q is Coulombs (C) N = C * m/s * (Bunits) N*s/(C*m) = Bunits Newton seconds per Coulomb meter 1 Bunit is 1 Tesla (T) Stuff to do:: write code to draw a bar magnet, with field lines between the poles SVG (use JavaScript, Raphael, etc.) write code to do the various calculations ]]></Notes> <script implName="lang:javascript:inline:"><![CDATA[ print("height = 56.78 meters\n"); ]]></script> <_-.XholonClass>  <PhysicalSystem/> <Block/>  <Height superClass="Length"/> </_-.XholonClass> <xholonClassDetails> <Block> <port name="height" connector="#xpointer(Height)"/> </Block> </xholonClassDetails> <PhysicalSystem> <Block> <Height>0.1 m</Height> <ElectricCharge>0.0 C</ElectricCharge> <MagneticFluxDensity>0.0 T</MagneticFluxDensity> </Block> </PhysicalSystem> <Blockbehavior implName="lang:python:inline:"><![CDATA[ # This works if pasted in as a last child of Block. height.incVal(0.02) print("Python wants something to do. 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